Urinary infections are serious at night and are considered to be related to factors such as drinking less water and having frequent sex. 1. Drinking less water: urinary tract infections are usually associated with bacterial infections, which may cause frequent urination, urinary urgency, painful urination, lower abdominal pain and other symptoms. Into the night patients drink less water, urinate less, the bacteria and toxins inside the urine increase, leading to aggravation of symptoms. 2. Frequent sex: patients with urinary tract infections have sex at night, if they don’t pay attention to sexual hygiene, it may lead to increased urinary tract irritation symptoms, which is also the main reason for the worsening of symptoms at night. It is recommended that patients increase the amount of water consumption, diligent urination, can flush out the bacteria inside the urinary tract, can help relieve symptoms. Also go to the hospital urology department, under the guidance of the doctor to give medication, can promote recovery.